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Enable SR-IOV on Intel Tigerlake iGPU

18 Sep 2022

My laptop cpu is i7-1165G7 with intergrated Iris Xe Graphics, which support SR-IOV with max 7 virtual functions. I’m trying to enable the iGPU SR-IOV.

  1. Get the linux-intel-lts kernel and checkout 5.15 branch which had patches to support SR-IOV

    # git clone  https://github.com/intel/linux-intel-lts.git
# git checkout 5.15/ADL-Linux-ER

  2. Get the latest GuC firmware from i915 branch

    # wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/i915/tgl_guc_70.1.1.bin
# mv tgl_guc_70.1.1.bin /lib/firmware/i915/

  3. Patch linux kernel to use the downloaded latest firmware

    diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
index b16ec1b18fd4..ab508b165397 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
@@ -54,7 +54,7 @@ void intel_uc_fw_change_status(struct intel_uc_fw *uc_fw,
        fw_def(ALDERLAKE_S,  0, guc_def(tgl,  70, 0, 3)) \
        fw_def(DG1,          0, guc_def(dg1,  69, 0, 3)) \
        fw_def(ROCKETLAKE,   0, guc_def(tgl,  70, 0, 3)) \
-       fw_def(TIGERLAKE,    0, guc_def(tgl,  70, 0, 3)) \
+       fw_def(TIGERLAKE,    0, guc_def(tgl,  70, 1, 1)) \
        fw_def(JASPERLAKE,   0, guc_def(ehl,  69, 0, 3)) \
        fw_def(ELKHARTLAKE,  0, guc_def(ehl,  69, 0, 3)) \
        fw_def(ICELAKE,      0, guc_def(icl,  69, 0, 3)) \

  4. build and install the kernel

  5. set i915 module params in cmdline

    i915.enable_guc=5 i915.max_vfs=7  i915.guc_log_level=5
    • enable_guc, set bit 2 to enable SRIOV
      • ENABLE_GUC_SUBMISSION BIT(0)
      • ENABLE_GUC_LOAD_HUC BIT(1)
      • ENABLE_GUC_SRIOV_PF BIT(2)

  6. enable virtual functions

    # echo 7 > /sys/devices/pci0000\:00/0000\:00\:02.0/sriov_numvfs

    image-20220912212525555

  7. set up libvirt XML to boot virtual machine with virtual function passthrough

        <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x00' slot='0x02' function='0x1'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
    </hostdev>

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